"JR North" wrote in message
diainc...
Your prop hub is slipping. Get the prop rebuilt.
JR
BTDT got the T-shirt, too

Mike Slater wrote:

I was cruising along in my 24ft pontoon boat when I got a real surprise.
Somebody please tell me how and why I could be running wide open throttle
at my normal 5500 rpm and then suddenly the boat took off like a bat out
of hell running at 8000 rpms and 25mph??? I never touched the throttle.
It has never run that fast ever. After about 2 minutes it went back down
to 5500 and never did 8000 again. Its a 60hp mercury Bigfoot outboard.
It has never done this before and I don't even know how it could rev that
high and go 25mph. Normal is 5500 and 17mph. What happened??

Mike


Nope. The boat went from its normal 17mph WOT cruising speed up to 25mph in
an instant.

Mike